#include "IdlHighlighter.h"

//
// REMARK: This code comes from Qt example.
// It should be updated to really comply with the IDL syntax
//

//------------------------------------------------------------------------------
IdlHighlighter_C::IdlHighlighter_C(QTextDocument *parent) : QSyntaxHighlighter(parent)
{
	HighlightingRule rule;

	keywordFormat.setForeground(Qt::darkBlue);
	keywordFormat.setFontWeight(QFont::Bold);
	QStringList keywordPatterns;
	keywordPatterns << "\\bchar\\b" << "\\bclass\\b" << "\\bconst\\b"
				 << "\\bdouble\\b" << "\\benum\\b" << "\\bexplicit\\b"
				 << "\\bfriend\\b" << "\\binline\\b" << "\\bint\\b"
				 << "\\blong\\b" << "\\bnamespace\\b" << "\\boperator\\b"
				 << "\\bprivate\\b" << "\\bprotected\\b" << "\\bpublic\\b"
				 << "\\bshort\\b" << "\\bsignals\\b" << "\\bsigned\\b"
				 << "\\bslots\\b" << "\\bstatic\\b" << "\\bstruct\\b"
				 << "\\btemplate\\b" << "\\btypedef\\b" << "\\btypename\\b"
				 << "\\bunion\\b" << "\\bunsigned\\b" << "\\bvirtual\\b"
				 << "\\bvoid\\b" << "\\bvolatile\\b";
	foreach (const QString &pattern, keywordPatterns)
	{
		rule.pattern = QRegExp(pattern);
		rule.format = keywordFormat;
		highlightingRules.append(rule);
	}

	classFormat.setFontWeight(QFont::Bold);
	classFormat.setForeground(Qt::darkMagenta);
	rule.pattern = QRegExp("\\bQ[A-Za-z]+\\b");
	rule.format = classFormat;
	highlightingRules.append(rule);

	singleLineCommentFormat.setForeground(Qt::red);
	rule.pattern = QRegExp("//[^\n]*");
	rule.format = singleLineCommentFormat;
	highlightingRules.append(rule);

	multiLineCommentFormat.setForeground(Qt::red);

	quotationFormat.setForeground(Qt::darkGreen);
	rule.pattern = QRegExp("\".*\"");
	rule.format = quotationFormat;
	highlightingRules.append(rule);

	functionFormat.setFontItalic(true);
	functionFormat.setForeground(Qt::blue);
	rule.pattern = QRegExp("\\b[A-Za-z0-9_]+(?=\\()");
	rule.format = functionFormat;
	highlightingRules.append(rule);

	commentStartExpression = QRegExp("/\\*");
	commentEndExpression = QRegExp("\\*/");
}


//------------------------------------------------------------------------------
 void IdlHighlighter_C::highlightBlock(const QString &text)
 {
     foreach (const HighlightingRule &rule, highlightingRules) 
	 {
         QRegExp expression(rule.pattern);
         int index = expression.indexIn(text);
         while (index >= 0) {
             int length = expression.matchedLength();
             setFormat(index, length, rule.format);
             index = expression.indexIn(text, index + length);
         }
     }
     setCurrentBlockState(0);

     int startIndex = 0;
     if (previousBlockState() != 1)
         startIndex = commentStartExpression.indexIn(text);

     while (startIndex >= 0)
	 {
         int endIndex = commentEndExpression.indexIn(text, startIndex);
         int commentLength;
         if (endIndex == -1) 
		 {
             setCurrentBlockState(1);
             commentLength = text.length() - startIndex;
         } else 
		 {
             commentLength = endIndex - startIndex + commentEndExpression.matchedLength();
         }
         setFormat(startIndex, commentLength, multiLineCommentFormat);
         startIndex = commentStartExpression.indexIn(text, startIndex + commentLength);
     }
 }